This functionality can be achieved with the "Activity Streams".
For example "unread content": https://en.delphipraxis.net/discover/unread/.
You can configure the streams to your needs - much more flexible than any portal page.
Well, yes … it was just to inform you about this interesting feature.
In the end, you can configure your own feeds. You can create feeds from special members, like just EMBT-employees, or a feed for special forums.
@Uwe Raabe: I will check this.
The theme is responsive. On my iPhone7 it works pretty well.
Something special that is missing?
Just to compare, surf to https://invisioncommunity.com/forums/, this is a good as this software can be on a mobile device.
If someone wants the challenge - this software has an exensive REST-interface. ;-)